package com.kexio.pay.provider;

import com.kexio.pay.config.UnionPayProperties;
import com.kexio.pay.dto.PaymentRequest;
import com.kexio.pay.dto.PaymentResponse;
import com.kexio.pay.entity.PaymentCallback;
import com.kexio.pay.enums.PaymentMethod;
import com.kexio.pay.enums.PaymentStatus;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;

import java.util.*;

/**
 * 银联支付提供者（预留实现）
 * 
 * 注意：银联支付需要证书配置，相对复杂
 * 当前仅提供框架，实际使用需完善证书签名逻辑
 * 
 * @author Kexio Team
 */
@Component
public class UnionPayProvider implements PaymentProvider {
    
    private static final Logger logger = LoggerFactory.getLogger(UnionPayProvider.class);
    private static final String PROVIDER_ID = "unionpay";
    private static final String PROVIDER_NAME = "银联支付";
    
    @Autowired
    private UnionPayProperties unionPayProperties;
    
    @Override
    public String getProviderId() {
        return PROVIDER_ID;
    }
    
    @Override
    public String getProviderName() {
        return PROVIDER_NAME;
    }
    
    @Override
    public Set<PaymentMethod> getSupportedMethods() {
        Set<PaymentMethod> methods = new HashSet<>();
        methods.add(PaymentMethod.UNIONPAY_QR);
        methods.add(PaymentMethod.UNIONPAY_WAP);
        return methods;
    }
    
    @Override
    public boolean isSupported(PaymentMethod method) {
        return getSupportedMethods().contains(method);
    }
    
    @Override
    public PaymentResponse createPayment(PaymentRequest request) {
        logger.warn("银联支付暂未完整实现，需配置证书后使用");
        
        PaymentResponse response = new PaymentResponse();
        response.setOrderNo(request.getOrderNo());
        response.setSuccess(false);
        response.setMessage("银联支付功能开发中，敬请期待");
        
        // TODO: 实现银联统一下单逻辑
        // 1. 加载商户证书
        // 2. 构建请求参数
        // 3. 使用证书签名
        // 4. 发送请求到银联网关
        // 5. 验证响应签名
        // 6. 解析二维码URL
        
        return response;
    }
    
    @Override
    public PaymentStatus queryPayment(String orderNo, String thirdPartyOrderNo) {
        logger.warn("银联支付查询暂未实现: orderNo={}", orderNo);
        
        // TODO: 实现银联订单查询逻辑
        return PaymentStatus.PENDING;
    }
    
    @Override
    public boolean closePayment(String orderNo, String thirdPartyOrderNo) {
        logger.warn("银联支付关闭订单暂未实现: orderNo={}", orderNo);
        
        // TODO: 实现银联关闭订单逻辑
        return false;
    }
    
    @Override
    public boolean verifyCallback(PaymentCallback callback) {
        logger.warn("银联支付回调验签暂未实现");
        
        // TODO: 实现银联回调签名验证
        // 1. 提取签名
        // 2. 加载银联公钥证书
        // 3. 验证签名
        
        return false;
    }
    
    @Override
    public CallbackResult processCallback(PaymentCallback callback) {
        logger.warn("银联支付回调处理暂未实现");
        
        // TODO: 实现银联回调数据处理
        return CallbackResult.failure("银联支付功能开发中");
    }
    
    @Override
    public boolean isConfigured() {
        return StringUtils.hasText(unionPayProperties.getMchId())
            && StringUtils.hasText(unionPayProperties.getApiKey());
    }
    
    @Override
    public Map<String, String> getConfigInfo() {
        Map<String, String> info = new LinkedHashMap<>();
        info.put("providerId", PROVIDER_ID);
        info.put("providerName", PROVIDER_NAME);
        info.put("mchId", unionPayProperties.getMchId());
        info.put("testMode", String.valueOf(unionPayProperties.isTestMode()));
        info.put("serverUrl", unionPayProperties.getServerUrl());
        info.put("configured", String.valueOf(isConfigured()));
        info.put("status", "预留接口，需配置证书后使用");
        return info;
    }
}

